All Experimenters' Mtg - 31 Mar 03

f Week in Review: 03/24/03 –03/30/03

Ron Moore – FNAL

• Store Summary: Another So-So week• Woes in Pbar-land• Schedule for Week

All Experimenters' Mtg - 31 Mar 03

R. Moore - FNAL 2

f Store Summary

StoreInitialLumi (E30)

CDF Deliv’dLumi

TerminationDuration

(hr) Comments

2343 31.5 804 Intentional 10.1Poor lifetime; High CDF losses;

D47 turbo pump failed

2357 28.5 1181 Intentional 20.9High CDF proton losses;

collimators aligned during store

2361 17.7 592 Abort 13.1Shot from only 80 mA; no Tev transverse

dampers; good proton losses; D0Q3 lead failure

2370 29.2 1212 Intentional 19.636x32 store (missed 1 pbar transfer);

Proton bunch length blow-up in squeeze; high CDF proton losses

2372 0.5 1.2 Intentional 0.75Smooth shot-setup;

B17 separator sparks wiped out pbars

2375 20.4 576 Intentional 11.5Shot from 108 mA; No transverse dampers; poor lifetime on helix; CDF proton losses good again

800 1000 1200 1400 1600 1800 2000 2200 24001000

2000

3000

4000

5000

6000

7000

8000

Proton Intensity @ HEP

Pro

ton

Inte

nsity

(E

9)

800 1000 1200 1400 1600 1800 2000 2200 2400

0

200

400

600

800

1000

Pbar Intensity @ HEP

Pba

r In

tens

ity (

E9)

800 1000 1200 1400 1600 1800 2000 2200 2400

0

5

10

15

20

25

30

35

40

45

Store NumberInitial Luminosity

Avg

Lum

i (E

30)

Store Number

0.0

50.0

100.0

150.0

200.0

250.0

300.0

9/30 12/30 3/31 6/30 9/29

Date

Inte

gra

ted

Lu

min

os

ity

(p

b-1

)

Stretch Goal

Base Goal

Actual

FY03 Performance vs Plan

5 pb-1 behind base plan now

Courtesy Steve Holmes

All Experimenters' Mtg - 31 Mar 03

R. Moore - FNAL 7

f Pbar Woes

• On 3/24, PMAG began tripping on ground fault indication– Pulsed magnet downstream of Li lens, bends pbars 3 into AP2 line

– Required 12 hours to replace

– This PMAG has 4.6 E6 pulses (not counting testing pulses)

– Bad electrical connection on endplate (just like previous failed PMAG)

• Also on 3/24, AP2 vacuum degraded– Stacking was not really affected by the vacuum – keep running

• On 3/25 (after PMAG replacement), stacking deteriorated badly– AP2 vacuum failed – almost at atmosphere

– Ti window at upstream end (within target station) likely ruptured

– Added 2 new 3 mil thick Ti windows plus a roughing pump port at upstream of AP2 line (within Transport enclosure)

– Replace the failed window during summer shutdown

All Experimenters' Mtg - 31 Mar 03

R. Moore - FNAL 8

f Failed PMAG

Pbars go this way to AP2 & Debuncher

PMAG

new vacu

um windows

new ro

ughing pump portAP3

Target

enclosure

AP2

Pbars go th

is way

to D

ebunch

er

All Experimenters' Mtg - 31 Mar 03

R. Moore - FNAL 11

f Other machines

• Linac – LRF4 hanging on day-to-day

• Booster– Raised MP01 by 2 mm to reduce nearby dogleg strength

– Even better now: MiniBoone > 4 E16 protons/hr while stacking, close to 5 E16 protons/hr if not stacking

• Recycler– Vacuum techs found a vacuum leak on ion pump flange @ 202

– Is this the source of lifetime problems?

– Need ~6 hour access to repair leak

All Experimenters' Mtg - 31 Mar 03

R. Moore - FNAL 12

f Tevatron

• Attempt at orbit smoothing maintenance failed last week– Vertical corrector near IPs would run too hard > 50 amps

– Vertical orbits have changed by 1 mm since Thursday

– Will smooth orbits and tune-up a bit this week

• Transverse dampers– Proton instabilities when dampers on

– Electronics checked out OK

– Poor coupling on proton helix exacerbated anti-damping?

• Collimators– Raised current limit on motors back to 6 A

– Removed motor/LVDT offsets; aligned proton collimators

– Added filtering capacitors on cables to eliminate fake limit switch errors

– CDF proton halo losses look OK now

Weekly Schedule

All Experimenters' Mtg - 31 Mar 03

R. Moore - FNAL 14

f Changing of the Guard

• Keith Gollwitzer becomes Run Coordinator tonight

• Thank you for your support over the past 4 months!

• Good Luck, Keith!

• Best wishes for a stable accelerator complex and improving luminosity delivered and written to tape!

All Experimenters' Mtg - 31 Mar 03

R. Moore - FNAL 15

f Summary

• Another mediocre week: only 3.8 pb-1 delivered

• Pbar pulsed magnet and AP2 vacuum failures resulted in > 24 hours with no stacking

• Problems with dampers and/or orbits prevented us from using Tev transverse dampers

• Booster MP01 raised 2 mm allowing more beam to MiniBoone

• Have 3 shifts of Tev maintenance for smoothing and tune-up

• Stack & Store for remainder of week